RETRACTED: Microstructure and durability properties of cement mortars containing nano-TiO2 and rice husk ash

Mohseni, Ehsan; Naseri, Farzad; Amjadi, Ramin; Khotbehsara, Mojdeh Mehrinejad; Ranjbar, Malek Mohammad

doi:10.1016/j.conbuildmat.2016.03.136

Cited by 201 publications

(86 citation statements)

References 29 publications

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“…The migration coefficients were calculated using the formula explained in the standard. The chloride penetration was then used to calculate the migration coefficient according to Equation 2

D_{nssm} = \frac{0.0239 ((), 273 + T) L}{((), U - 2) t} ((), x_{d} - 0.0238 \sqrt{\frac{(273 + T) L x_{d}}{U - 2}})

…”

Section: Experimental Programmentioning

confidence: 98%

Evaluating the effects titanium dioxide on resistance of cement mortar against combined chloride and sulfate attack

Joshaghani

2018

Structural Concrete

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The objective of this study is to develop the durability of mortar mixtures against combined chloride and sulfate deterioration by replacing a certain amount of limestone cement with titanium dioxide (TiO2). Marine environments contain high concentrations of chlorides and sulfates. To improve the concrete durability within such conditions, it is important to control the concentration of both ions. The application of TiO2 in concrete has been increasingly considered in recent years. However, the durability issues of mortar made with TiO2 have not been evaluated. To achieve this purpose, an experimental program was designed to assess five different corrosive solutions of chloride and sulfate to investigate different partial cement replacement by TiO2. The compressive strength, surface electrical resistance, mass change, dynamic modulus of elasticity, Rapid chloride migration test (RCMT), Rapid chloride permeability test (RCPT), and half‐cell energy were tested in the binary and ternary solutions. Results indicated that using these nanoparticles as a partial replacement of cement developed the pore structure of the mortar, leading to the improved durability of the mortar and less deterioration in control specimens. Also, the chloride penetration increased by adding sulfate content at early age immersion. With little to no TiO2 in the mortar specimens, chloride ions mitigated the corrosive influences of a sulfate attack.

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“…The migration coefficients were calculated using the formula explained in the standard. The chloride penetration was then used to calculate the migration coefficient according to Equation 2

D_{nssm} = \frac{0.0239 ((), 273 + T) L}{((), U - 2) t} ((), x_{d} - 0.0238 \sqrt{\frac{(273 + T) L x_{d}}{U - 2}})

…”

Section: Experimental Programmentioning

confidence: 98%

Evaluating the effects titanium dioxide on resistance of cement mortar against combined chloride and sulfate attack

Joshaghani

2018

Structural Concrete

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“…In recent years, mortars made with various modified materials have been investigated [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Awoyera

Dawson

Thom

et al. 2017

Construction and Building Materials

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Using industrial wastes and local materials as artificial aggregates in cement based materials remains a relevant measure for conservation of natural sources. In this study, novel cementitious mixes containing pulverized ceramic blended cement, ceramic aggregate and laterite were systematically combined to produce cement mortars. The mortar specimens were cured in water for a maximum of 28 days. At maturity, nondestructive tests, X-ray CT scan and Ultrasonic pulse velocity, were performed on hardened mortars. Thereafter, a series of predefined properties, namely dry bulk density, compressive and flexural strength, water absorption coefficient (due to capillary) of the hardened mortars were determined. Finally, in order to understand the hydration mechanism of the materials as it relates to the strength properties, microscale tests, SEM and XRD, were used to examine the fragments of the selected mortars. From the results, a mortar sample containing 10% ceramic powder and 100% ceramic aggregate as replacements for cement and sand respectively, gave higher strength values than the reference and other mixes.Microstructural analysis of the best mix revealed that it has larger proportions of ettringite, portlandite and calcite than the reference mix, and this could be responsible for the strength 2 gained. Thus, despite the apparent low reactivity of crushed ceramic material, this can improve bonding in cement-based mixture, when used at an appropriate concentration.

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“…In previous studies, several types of materials with nanoparticles have been used to improve the mechanical properties, durability behavior, and microstructure of cement paste, mortar, and concrete, for example, nano-SiO 2 [16][17][18], nano-TiO 2 [15,19], nano-Al 2 O 3 [20,21], nano-Fe 2 O 3 [21], carbon nanotubes [22], nanoclay [15], and nanolimestone [18]. However, among these nanoparticles, nano-SiO 2 (nanosilica) can be considered as the most frequently used one in improving the performance of concrete [15,17].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Younis

Mustafa

2018

Advances in Materials Science and Engineering

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e aim of this paper was to examine the feasibility of using nanoparticles of SiO 2 (nanosilica) to improve the performance of recycled aggregate concrete (RAC) containing recycled aggregate (RA) derived from processing construction and demolition waste of concrete buildings. e examined properties include compressive strength, splitting tensile strength, and water absorption. e study also includes examining the microstructure of RA and RAC with and without nanoparticles of SiO 2 . In total, nine mixes were investigated. Two mixes with RA contents of 50% and 100% were investigated and for each RA content; three mixes were prepared with three different nanoparticles dosages 0.4%, 0.8%, and 1.2% (by mass of cement). A control mix with natural aggregate (NA) was also prepared for comparison reasons. e results show that nanoparticles of silica can improve the compressive strength, tensile strength, reduce the water absorption, and modify the microstructure of RAC.

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RETRACTED: Microstructure and durability properties of cement mortars containing nano-TiO2 and rice husk ash

Cited by 201 publications

References 29 publications

Evaluating the effects titanium dioxide on resistance of cement mortar against combined chloride and sulfate attack

Evaluating the effects titanium dioxide on resistance of cement mortar against combined chloride and sulfate attack

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

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RETRACTED: Microstructure and durability properties of cement mortars containing nano-TiO2 and rice husk ash

Cited by 201 publications

References 29 publications

Evaluating the effects titanium dioxide on resistance of cement mortar against combined chloride and sulfate attack

Evaluating the effects titanium dioxide on resistance of cement mortar against combined chloride and sulfate attack

Suitability of mortars produced using laterite and ceramic wastes: Mechanical and microscale analysis

Feasibility of Using Nanoparticles of SiO2 to Improve the Performance of Recycled Aggregate Concrete

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Product

Resources

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Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete